We analyze the behavior of the density of states in a singlet s-wave superconductor with weak magnetic impurities in the clean limit by using the method of optimal fluctuation. We show that the density of states varies as In N(E) ∝ |E - Δ|(7-d)/4 near the mean field gap edge Δ0 in a d-dimensional superconductor. The optimal fluctuation in d > 1 is strongly anisotropic. We compare the density of states with that obtained in other recent approaches. © 2002 Elsevier Science B.V. All rights reserved.
Publication Source (Journal or Book title)
Physica B: Condensed Matter
Vekhter, I., Shytov, A., Gruzberg, I., & Balatsky, A. (2003). Tail states in superconductors with weak magnetic impurities. Physica B: Condensed Matter, 329-333 (II), 1446-1447. https://doi.org/10.1016/S0921-4526(02)02372-4